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Kuenteng /KT 15a or 17a 36/48v dual voltage controller kit, cost about £100. Topbikekit or their store on Aliexpress. get everything you need so add a lcd display, pas , throttle and e brakes.

I use a trueing stand I made out of wood. though one can use and old fork or rear triangle of a bike as a trueing stand. All you need ot do is mount them in some way to be practicle. I usually ping test for tension but also do have one of those manual spoke tensionomaters that one squeezes to...

Joining wires and leccy tape is not a great idea on ebikes , if cutting off connectors then only three wires so solder and heat shrink each wire separately, and if you slide a 8mm dia piece up the main wire first it will cover all three smaller ones when done. Other option is to open the...

Throttle julet connector will be the single Yellow , the other Yellow pair together will be the brakes sensors. You may have to buy a Yose throttle as the wire sequence may be different to most other throttles.

Of the six googles listed none would be recommended by most on this forum.

Using google is one sure way to buy the most expensive and often the receive worse CS from a seller.

The B rad still needs riv nuts to hold a battery.

Minimum needs to be M5 as that is what a std rivnut screw size is.

My ute's tsdz2 has a double 32/42t set up .

BBS & tsdz clearance is pretty much the same.

I think the suggestion of asking where to get a new controller may have been because the OP wasn't keen or sure about making a repair.

Any 36v/42v 1.8a - 2a charger will work , you need one with a 5.5mm x 2.1mm dc jack fitted. Plenty on the two main market web place sites. Simply select the two pieces of detail mentioned above from the drop down boxes. 25.2V 29.4V 36V 42V Electric Bicycle Scooter Ebike Battery Charger Li-ion...

As has been mentioned it relates to a motor Hall fault, could be a failed motor hall, bad wire connection at the controller, motor cable connector not fully home or a damaged motor wire where it enters the motor axle. Has the bike fallen over or been damaged , maybe the motor cable has been...

Afaics the fault lies at the feet of the relatives who bought and allowed underage children to ride and use an unregistered motor vehicle on public highways and worst of all with no head protection, simply asking for trouble and that is what they got BIG TIME.

Where I live the terrain is mostly flat, I have to cycle some 20 miles or so to find some thing that needs climbing.

Thay's what it is usually used for , just sometimes I don't always need the heavier larger CF. I haven't yet used the tsdz2 out of ECO mode as it tends to have the power I need in ECO.

Easy to adjust the speed by a ew mph , pedal faster.

As d8veh has said only one wire needs to short against the opposing polarity .of a cell.

The basic Surron if you want to call it that requires a CBT16 licence , It is a moped. Can do 30mph and requires tin lids, they took a chance and lost . A lesson for all who wish to break the law to think about. The clip on the news with the plod van following shows the moped being ridden very...

You can replace the electronics if themotor has the 9 pin motor connector. KT controller and lcd is the best option and one gets five levels of powere via current control.